Improvement in cements for roofing purposes



Examiner w soss'n rureo For: 'iussmo Q 06. 00st,, COATING QR snc JOS. THOMPSON, OF NORTH WRENTHAM, MASSACHUSETTS.

IMPROVEMENT IN CSMENTS FOR ROOFING PURPOSES.

Specification forming part of Letters Patent No. 21,158, dated August 10, 1858.

To all whom it may concern Be it known that I, JOSEPH THOMPSON, of

North Wrentham, in the county of Norfolk and State of Massachusetts, have invented a new composition of matter to be applied for roofing and other purposes; and I do hereby declare that the following is a full and exact v description thereof.

In the process of compounding my invention I make use of silicates of otash soda, or silicates of the alkaline earths as aITa'tI'dition to lg, rosin-residues, oil-resi ues, and rosin and other or s, or

ickene compound elastic and resistant to extremes of natural heat and cold.

In a patent granted to me for the use of 11ecom osedearth mattercontainingsoluble silicates, these bodies in a natural state are referred toaspossessingvaluablequalities. Subsequent practice has proved that any soluble silicate dissolved in water and mixed with a r and oily bodies when heated, or even in a natural tem- "perature,will be decomposed so far as to form soda one gallon oi rosin-na htha or other uafifitha, eight gallons of rosin-oil twenty-ion! ga ons of coal-tar and ten gallons of water. The agltator Being in motion combination ensues, and a uniform mass results at common temperatures; butI sometimes heat this compound. To this I add so much sand or other e purpose of rendering iii-e powdered material as will impart the consistency necessary for laying on a thick coat it for a roof or pavement. After adding less earthy material, I also saturate paper with it, orI add it to the pulp in manufacturing a valuuable sheathing.

The water used in this composition dries out and allows the mastic to close its pores and become compact.without being liable to soften or become brittle at the extremes of natural temperature.

When I use paper saturated and wish to cause it to adhere, I mix in a kettle, which can be heated,five pounds saturated solution of silicate of soda, forty oms'ofmnne'nrmm- "oil dlsttlla'fiomten pounds pitch from rosin-oil, twenty poun s itch from coa -tar, an ve pou ds of naphtha. The whole Being heated to the bot lug-point, sand or any )I ment is added to give consistency.

I do not claim any mixture of the various kinds of tar and oils, but adapt such materials to the intended use, being governed in choice by the consideration of price, and confine myself to the modification produced in such mixtures by the use of soluble silicates. I call my solid mixed compound .Thompsons Improved Mastic Roofing, and my fabrics Thompsons Improved Felt.

Neither do I claim the broad ground of a combination of one or more alkaline or earthy silicates with one or more tarry matters; but

What I do claim is- The composition substantially as hereinbe fore described, consisting of an alkaline silicate, oil or oils, coal-tar or pitch of coal-tar, and naphtha, (water being added when necessary,) such being for the purpose or purposes hereinbefore set forth.

JOSEPH THOMPSON. Witnesses:

FRANK T. WARE,

8m. WARNER, Jr. 

